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## Homework Statement

Pressure drops in welders tank of oxygen gas from p

_{1}=150atm to p

_{2}=120atm .

How much of the gas will be used ?

## Homework Equations

## The Attempt at a Solution

In my mind the simplest way of looking at this problem is to consider the process isothermal.

But then the volume of the gas increases when pressure drops (Ideal gas law). This contradicts the question.

Since I do not know the temperatures before and after, I don't know what to do. I am looking for different view at this problem, some help?